Question

A stone is dropped from a building of height of 30cm.It accelerates at a rate of 8m/s2.What will be velocity of the stone when it hits the ground ?How long will it take to reach the ground

Answer 1

Answer:

u=0m/s

s=30cm

=30/100m

=0.3m

a=8m/s2

s=1/2atsq+ut

0.3=1/2×8×tsq+0×t

0.3=1/16tsq

0.3×16=tsq

4.8=tsq

root4.8=t

t=root4.8sec

v=u+at

=0+8×root4.8

=8root4.8m/s